465
FNCA52 TJSJ 280820
FWFSJU
FIRE WEATHER PLANNING FORECAST FOR PUERTO RICO
NATIONAL WEATHER SERVICE SAN JUAN PR
420 AM AST SUN DEC 28 2025
DISCUSSION
DRYING CONDITIONS CONTINUE, ESPECIALLY ACROSS SOUTHERN PUERTO
RICO. NO RAINFALL IS EXPECTED TODAY, AND NO EFFECTIVE RAIN-MAKERS
ARE ANTICIPATED THROUGH AT LEAST MID TO LATE WEEK, ALLOWING FUELS
TO CONTINUE DRYING. FIRE DANGER REMAINS LOW TODAY, AND NO ACTIVE
FIRES ARE REPORTED OR IDENTIFIED ACROSS THE ISLANDS. KBDI VALUES
CONTINUE TO TREND UPWARD, WITH RECENT READINGS NEAR 545 AT CABO
ROJO AND 509 AT CAMP SANTIAGO, INDICATING INCREASING FUEL DRYNESS
AND APPROACHING FIRE WEATHER HEADLINE THRESHOLDS (AROUND 550).
PERIODS OF LOW RELATIVE HUMIDITY, COMBINED WITH MODERATE BREEZES
AND OCCASIONAL STRONGER TRADE-WIND GUSTS, MAY BRIEFLY ENHANCE FIRE
SPREAD POTENTIAL. OVERALL FIRE DANGER REMAINS LOW, BUT CONTINUED
DRYING WARRANTS CLOSE MONITORING, PARTICULARLY ACROSS SOUTHERN
PUERTO RICO.
PRZ014-291000-
SOUTHEAST COASTAL PLAINS-
420 AM AST SUN DEC 28 2025
TODAY TONIGHT MON
CLOUD COVER MCLEAR MCLEAR MCLEAR
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 20 10 0
TEMP (24H TREND) 85 (+2) 62 (-4) 83
RH % (24H TREND) 42 (-10) 90 (+3) 49
WIND 20FT/EARLY(MPH) E 9 NE 9 E 12
WIND 20FT/LATE(MPH) E 9 NE 9 E 12
MIXING HGT(FT-AGL/MSL)5210 4750
TRANSPORT WND (MPH) NE 3 E 9
VENT RATE (KT-FT) 15630 38000
DISPERSION 5 5
DSI 5 3 5
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ015-291000-
SOUTHERN HILLS-
420 AM AST SUN DEC 28 2025
TODAY TONIGHT MON
CLOUD COVER MCLEAR MCLEAR MCLEAR
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 10 0 0
TEMP (24H TREND) 80 (+2) 59 (-5) 79
RH % (24H TREND) 53 (-10) 98 (+7) 57
WIND 20FT/EARLY(MPH) NE 9 N 9 E 9
WIND 20FT/LATE(MPH) NE 9 N 9 E 9
MIXING HGT(FT-AGL/MSL)5700 5310
TRANSPORT WND (MPH) N 3 E 8
VENT RATE (KT-FT) 17100 37170
DISPERSION 5 5
DSI 5 2 5
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ016-291000-
NORTH COASTAL PLAINS-
420 AM AST SUN DEC 28 2025
TODAY TONIGHT MON
CLOUD COVER MCLEAR MCLEAR CLEAR
PRECIP TYPE SHOWERS NONE NONE
CHANCE PRECIP (%) 0 0 0
TEMP (24H TREND) 82 (0) 64 (-2) 81
RH % (24H TREND) 56 (-6) 92 (-1) 57
WIND 20FT/EARLY(MPH) N 11 NE 11 NE 12
WIND 20FT/LATE(MPH) N 11 NE 11 NE 12
MIXING HGT(FT-AGL/MSL)5140 5280
TRANSPORT WND (MPH) NE 6 E 8
VENT RATE (KT-FT) 25700 36960
DISPERSION 5 5
DSI 5 2 5
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ017-291000-
NORTHERN HILLS-
420 AM AST SUN DEC 28 2025
TODAY TONIGHT MON
CLOUD COVER CLEAR CLEAR MCLEAR
PRECIP TYPE NONE NONE SHOWERS
CHANCE PRECIP (%) 0 0 10
TEMP (24H TREND) 80 (0) 61 (-3) 80
RH % (24H TREND) 54 (-8) 96 (0) 57
WIND 20FT/EARLY(MPH) N 11 NE 11 NE 11
WIND 20FT/LATE(MPH) N 11 NE 11 NE 11
MIXING HGT(FT-AGL/MSL)5510 5420
TRANSPORT WND (MPH) NE 5 E 6
VENT RATE (KT-FT) 22040 27100
DISPERSION 5 5
DSI 5 2 5
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ018-291000-
WEST COAST-
420 AM AST SUN DEC 28 2025
TODAY TONIGHT MON
CLOUD COVER CLEAR CLEAR MCLEAR
PRECIP TYPE NONE NONE SHOWERS
CHANCE PRECIP (%) 0 0 10
TEMP (24H TREND) 84 (+1) 62 (-3) 82
RH % (24H TREND) 51 (-8) 91 (-1) 54
WIND 20FT/EARLY(MPH) N 13 NE 13 E 9
WIND 20FT/LATE(MPH) N 13 NE 13 E 9
MIXING HGT(FT-AGL/MSL)5300 5010
TRANSPORT WND (MPH) N 6 E 5
VENT RATE (KT-FT) 26500 20040
DISPERSION 5 5
DSI 5 4 5
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ019-291000-
EASTERN INTERIOR-
420 AM AST SUN DEC 28 2025
TODAY TONIGHT MON
CLOUD COVER MCLEAR MCLEAR MCLEAR
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 10 10 0
TEMP (24H TREND) 81 (+2) 61 (-4) 80
RH % (24H TREND) 58 (-6) 96 (+3) 61
WIND 20FT/EARLY(MPH) N 9 N 10 NE 10
WIND 20FT/LATE(MPH) N 9 N 10 NE 10
MIXING HGT(FT-AGL/MSL)5690 5040
TRANSPORT WND (MPH) N 6 E 9
VENT RATE (KT-FT) 28450 40320
DISPERSION 5 5
DSI 4 2 5
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ022-291000-
LUQUILLO MOUNTAIN RANGE-
420 AM AST SUN DEC 28 2025
TODAY TONIGHT MON
CLOUD COVER PCLDY MCLEAR MCLEAR
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 20 20 20
TEMP (24H TREND) 77 (+3) 61 (-3) 76
RH % (24H TREND) 63 (-8) 96 (+1) 65
WIND 20FT/EARLY(MPH) N 6 N 6 NE 9
WIND 20FT/LATE(MPH) N 6 N 6 NE 9
MIXING HGT(FT-AGL/MSL)4800 5070
TRANSPORT WND (MPH) NE 5 E 9
VENT RATE (KT-FT) 19200 40560
DISPERSION 5 5
DSI 4 2 5
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ023-291000-
CENTRAL MOUNTAIN RANGE-
420 AM AST SUN DEC 28 2025
TODAY TONIGHT MON
CLOUD COVER CLEAR CLEAR MCLEAR
PRECIP TYPE NONE NONE SHOWERS
CHANCE PRECIP (%) 0 0 10
TEMP (24H TREND) 79 (+4) 57 (-5) 78
RH % (24H TREND) 55 (-11) 100 (+3) 57
WIND 20FT/EARLY(MPH) N 12 NE 12 NE 8
WIND 20FT/LATE(MPH) N 12 NE 12 NE 8
MIXING HGT(FT-AGL/MSL)5970 6080
TRANSPORT WND (MPH) N 3 E 5
VENT RATE (KT-FT) 17910 24320
DISPERSION 5 5
DSI 5 2 5
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ024-291000-
CAYEY MOUNTAIN RANGE-
420 AM AST SUN DEC 28 2025
TODAY TONIGHT MON
CLOUD COVER MCLEAR MCLEAR MCLEAR
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 10 10 10
TEMP (24H TREND) 77 (+2) 60 (-3) 75
RH % (24H TREND) 60 (-8) 99 (+5) 66
WIND 20FT/EARLY(MPH) N 6 N 6 NE 8
WIND 20FT/LATE(MPH) N 6 N 6 NE 8
MIXING HGT(FT-AGL/MSL)5600 4540
TRANSPORT WND (MPH) N 6 E 10
VENT RATE (KT-FT) 28000 40860
DISPERSION 5 5
DSI 5 2 5
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ025-291000-
VIEQUES-
420 AM AST SUN DEC 28 2025
TODAY TONIGHT MON
CLOUD COVER PCLDY PCLDY PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 20 30 30
TEMP (24H TREND) 82 (0) 69 (-1) 81
RH % (24H TREND) 53 (-5) 87 (+4) 58
WIND 20FT/EARLY(MPH) NE 10 N 13 E 11
WIND 20FT/LATE(MPH) NE 10 N 13 E 11
MIXING HGT(FT-AGL/MSL)4680 3810
TRANSPORT WND (MPH) NE 6 E 12
VENT RATE (KT-FT) 23400 38100
DISPERSION 5 5
DSI 6 6 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ026-291000-
CULEBRA-
420 AM AST SUN DEC 28 2025
TODAY TONIGHT MON
CLOUD COVER PCLDY PCLDY PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 20 30 20
TEMP (24H TREND) 82 (0) 70 (-2) 81
RH % (24H TREND) 54 (-5) 85 (+4) 57
WIND 20FT/EARLY(MPH) N 11 NE 13 G17 E 11
WIND 20FT/LATE(MPH) N 11 NE 13 G17 E 11
MIXING HGT(FT-AGL/MSL)4730 4160
TRANSPORT WND (MPH) NE 5 E 13
VENT RATE (KT-FT) 18920 45760
DISPERSION 5 5
DSI 6 6 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ027-291000-
SOUTHWEST COASTAL PLAINS AND MONA ISLAND-
420 AM AST SUN DEC 28 2025
TODAY TONIGHT MON
CLOUD COVER CLEAR MCLEAR MCLEAR
PRECIP TYPE NONE SHOWERS SHOWERS
CHANCE PRECIP (%) 0 10 10
TEMP (24H TREND) 84 (+1) 63 (-4) 84
RH % (24H TREND) 43 (-7) 88 (+2) 46
WIND 20FT/EARLY(MPH) SE 14 NE 17 SE 11
WIND 20FT/LATE(MPH) SE 14 NE 17 SE 11
MIXING HGT(FT-AGL/MSL)5410 5410
TRANSPORT WND (MPH) NE 3 E 7
VENT RATE (KT-FT) 16230 32460
DISPERSION 5 5
DSI 5 3 5
RH RECOVERY EXCELLENT
REMARKS...NONE.
VIZ001-291000-
SAINT THOMAS AND SAINT JOHN-
420 AM AST SUN DEC 28 2025
TODAY TONIGHT MON
CLOUD COVER PCLDY PCLDY PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 30 30 30
TEMP (24H TREND) 81 (0) 68 (-4) 79
RH % (24H TREND) 56 (-5) 88 (+9) 60
WIND 20FT/EARLY(MPH) NE 8 NE 10 E 11
WIND 20FT/LATE(MPH) NE 8 NE 10 E 11
MIXING HGT(FT-AGL/MSL)4600 4120
TRANSPORT WND (MPH) E 5 E 12
VENT RATE (KT-FT) 18400 41200
DISPERSION 5 5
DSI 6 5 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
VIZ002-291000-
ST CROIX-
420 AM AST SUN DEC 28 2025
TODAY TONIGHT MON
CLOUD COVER MCLEAR MCLEAR MCLEAR
PRECIP TYPE SHOWERS SHOWERS NONE
CHANCE PRECIP (%) 30 30 0
TEMP (24H TREND) 82 (0) 70 (-2) 81
RH % (24H TREND) 54 (-6) 83 (+5) 60
WIND 20FT/EARLY(MPH) NE 8 NE 8 E 10
WIND 20FT/LATE(MPH) NE 8 NE 8 E 10
MIXING HGT(FT-AGL/MSL)5330 5060
TRANSPORT WND (MPH) NE 5 E 13
VENT RATE (KT-FT) 21320 55660
DISPERSION 5 5
DSI 5 5 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
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